<template>
  <div id="app">
    <ul >
      <li v-for="(item,index) in myArr" :key="index">{{item}}</li>
    </ul>
    <button @click="addFn">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr: ["帅哥", "美女", "程序猿"],
      
    };
  },
  methods:{
    addFn(){
      let first = this.myArr.shift()
      this.myArr.push(first)
    }
  }
}
</script>
